Triarylmethane dyestuffs



Med May 4 2,199,517

UNITED STATES PATENT OFFICE 2,199,577 Y r TRIARYLMETHANE DYESTUFFS Karl Schmidt, 'Go lo gne-Mulheim, Germany, as-

signor to General Aniline & Film ()orporation, .a corporation of Delaware 5 Claims. (Cl. 260-392) The present invention relates w new triaryl- The invention is further illustrated but not methane dyestufis and to a method of preparing limited by the following examples, in which the the same, more particularly it relates to acid quantities are stated in parts vby weight: violet triamino-triarylmethane dyestuffs of the '51 general formula 5 parts of the dyestufi of the following constitution I z 1 cm OH; ea

are heated to about 100 C. with;50 parts of' In this formula R stands for a phenol radical pphenetidine until the reaction is complete; @By In which is substitutedin the nucleus by solubilizstirring with dilute hydrochloric acid the excess" w:- m ro p h as sulf nic acid and/ r earp-phenetidine is eliminated and the isolated dye- 25 bO Y C d p stufi is sulfonated until it becomes soluble in My new dyestufis are Obtained reacting water. The dyestufi corresponds in its free state arylmethane dyestuffs which contain twice in the to the formula v molecule the residue of vic.m-xylidine and. further in p-position to the carbincl carbon atom exchangeable groups such as halogen, the alkoxy, sulphonic acid or nitro. group, with aminophenols or substitution products thereof, The components are to be selected insuch amanner' g'g'that the triaminotriarylmethane dyestufi's ob tained contain at least two solubilizing groups such as the carboxylic acid. group or the sulfonic p acid group. These groups may also be intro'-.-' I duced after the formation of the dyestuffs. w; 40 The new dyestuffs are dark, water-soluble Y powders. They are especially suited for dyeing wool and silk and are distinguishedby a good leveling power. Above all the new dyestufis showing an extraordinary clearness of the shades solti' 45 are distinguished by an unexpected fastness to light. While the violet triarylmethane dyestuffs 01H: I Y

which had become known until now had a fastl I ness to light of about 1, the new dyestufis show d dyes wcol and silk in re vi le i .ad,s',-

503a iastness to light of -3 to 5; with a fastness to light of 8. 56

' Example 2 15 parts of the dyestufis of the following constitution am 0H: HRN NH, 110 A i/f are heated in parts of pyridine and 10 parts of water with 6.5 parts of 4-aminopheno1-2-sulfonic acid for 12 hours on the boiling water bath with stirring. After cooling the separated dyestuff is sucked ofi and washed with dilute sodium chloride solution. The dyestuff corresponds in the free state to the formula CH3 CH3 A H30 0 C 3 O and dyes wool and silk reddish violet shades with a fastness to light of 3 and is distinguished by a.

good leveling power.

Example 3 10 parts of the dyestuff of the following constitution are heated in 50 parts of pyridine and 10 parts of water with 4 parts of 2-hydroxy-3-aminobenzoic acid for 24 hours on the boiling water bath. The dyestuff which separates in well shaped crystals is sucked off, washed with sodium chloride fiztion and dried. The dyestufi-corresponds in its free state to the formula CH! CH;

Hm I -NHz H C/ CH:

COOH

and dyes wool and silk bluish violet shades with a fastness to light of 4.

Example 4 6 parts of the dyestuff of the following constitution 1 are heated in 30 parts of pyridine and 15 parts of water with 4 parts of 3-sulfo-5-amino-2-hydroxybenzoic acid for 15 hours to -100 C. Thereupon the mixture is given into 300 parts of hot water, the dyestuff is sucked oif and dried. It corresponds in its free state to the formula and dyes wool and silk bluish violet shades with a fastness to light of 4 to 5.

Example 5 15 parts of the dyestufiof the following constitution:

CH: CH: HaN l '=NH mo (aw-43H:

are heated in 75 parts of pyridine and 15 parts of water with 6.3 parts of 5-amino-2-hydroxybenzoic acid for 14 hours on the boiling water bath. After cooling the golden yellow crystals of the separated dyestuff are sucked off, the pyridine is washed off with water containing hydrochloric acid and the dyestuif is dried. It corresponds in its free state to the formula COOH and dyes Wool and silk in very clear violet shades with a fastness to light of 4.

The degree of fastness to light has been determined according to Verfahren, Normen und Typen, 7th edition, 1935, page 5, published by Verlag Chemie G. m. b. H., Berlin W. 35.

I claim:

1. As new products acid violet triaminotriarylmethane dyestuffs of the general formula wherein R stands for a phenol radical bearing substituents selected from the group consisting of COOH and --S03H, dyeing wool and silk very clear shades of very good fastness to light.

2. As new products acid violet triam-inotriarylmethane dyestufis of the general formula HaC wherein X stands for one of the group consisting of OH and alkoxy, Y stands for one of the group consisting of COOH and SOaH and Z stands for one of the group consisting of hydrogen and COOH, dyeing wool and silk very clear shades of very good fastness to light.

3. As new product the triaminotriarylmethane dyestuff which corresponds in its free state to the following formula CH: GHa HaN KFNH:

' NH I OSOaH $11 I dyeing Wool and silk very clear reddish violet shades with a fastness to light of 3.

4. As new product the triaminotriarylmethane dyestuff which corresponds in its free state to the following formula OH; on,

iN NH: H C CH dyeing wool and silk very clear reddish violet shades with a fastness to light of 3.

5. As new product the triaminotriarylmethane dyestuif which corresponds in its free state to the following formula I HiN NH! OOH KARL SCHMIDT. 

